NEW YORK (TheStreet) -- SanDisk Corp. (SNDK) stock is down 1.16% to $75.52 on heavy trading volume on Thursday afternoon after the data storage maker's stock rating was lowered to "neutral" from "positive" at Susquehanna.

The time to capitalize on Western Digital Corp.'s (WDC) plan to acquire SanDisk is over, Susquehanna analysts said in a note earlier today, according to Barron's.

The firm also lowered its price target to $79 from $86.50 because Western Digital is expected to pay $79 per share to SanDisk shareholders.

"Our $79/share estimate is comprised of $67.50 in cash and ~$11.60 in equity per share," analysts added, Barron's reports. "As such, given that SNDK shares currently trade within ~2% of our updated price target, we find it prudent to downgrade to 'neutral.'"

Last week, SanDisk shareholders approved the transaction, which is pending regulatory approval in China, but is expected to close in the 2016 second quarter.

So far today, 4.76 million shares of SanDisk have exchanged hands, compared with its average daily volume of 3.87 million shares.

Western Digital stock is down 2.16% to $47.67 this afternoon. 

Separately, SanDisk has a "hold" rating and a letter grade of C+ at TheStreet Ratings because of the company's strengths, such as largely solid financial position with reasonable debt levels by most measures and expanding profit margins, and its weaknesses, including disappointing stock performance, deteriorating net income and disappointing return on equity.

You can view the full analysis from the report here: SNDK

TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this article's author.